LTC1174_15 Datasheet, PDF (3/20 Pages) Linear Technology – High Efficiency Step-Down and Inverting DC/DC Converter

LTC1174
LTC1174-3.3/LTC1174-5
ELECTRICAL CHARACTERISTICS _{The ● denotes specifications which apply over the full operating}
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 9V, V_SHUTDOWN = V_IN, I_PGM = 0V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
Output Voltage Load Regulation
I_Q
Input DC Supply Current (Note 4)
V_LBTRIP
I_LBIN
I_LBOUT
Low-Battery Trip Point
Current into Pin 3
Current Sunk by Pin 2
V_HYST
I_PEAK
Comparator Hysteresis
Current Limit
R_ON
ON Resistance of Switch
LTC1174-3.3 (Note 3)
20mA < I_LOAD < 175mA, I_PGM = 0V
20mA < I_LOAD < 400mA, I_PGM = V_IN
LTC1174-5 (Note 3)
20mA < I_LOAD < 175mA, I_PGM = 0V
20mA < I_LOAD < 400mA, I_PGM = V_IN
Active Mode
LTC1174: 4V < V_IN < 12V, I_PGM = 0V
LTC1174HV: 4V < V_IN < 16V, I_PGM = 0V
Sleep Mode
LTC1174: 4V < V_IN < 12V
LTC1174HV: 4V < V_IN < 16V
SHUTDOWN (Note 4)
LTC1174: V_SHUTDOWN = 0V, 4V < V_IN < 12V
LTC1174HV: V_SHUTDOWN = 0V, 4V < V_IN < 16V
LTC1174: V_LBOUT = 0.4V
LTC1174HV: V_LBOUT = 0.4V
LTC1174/LTC1174HV
I_PGM = V_IN, V_OUT = 0V
I_PGM = 0V, V_OUT = 0V
LTC1174
LTC1174HV
–5 –70
–45 –70
–5 –70
–50 –70
450 600
450 600
130 180
130 180
1
10
2
25
1.25 1.4
0.5
1.0 1.2 1.5
0.6 0.8 1.5
7.5 15 30
● 0.54 0.60 0.83
● 0.27 0.34 0.53
●
0.75 1.30
●
0.90 1.55
t_OFF
Switch Off-Time (Note 6)
V_IH
SHUTDOWN Pin High
V_IL
SHUTDOWN Pin Low
I_IH
SHUTDOWN Pin Input Current
I_IL
SHUTDOWN Pin Input Current
V_OUT at Regulated Value
Minimum Voltage at Pin 8 for Device to Be Active
Maximum Voltage at Pin 8 for Device to Be in Shutdown
LTC1174: V_SHUTDOWN = 12V
LTC1174HV: V_SHUTDOWN = 16V
0 ≤ V_SHUTDOWN ≤ 0.8V
3
4
5
1.2
0.75
0.5
2.0
0.5
UNITS
mV
mV
mV
mV
µA
µA
µA
µA
µA
µA
V
µA
mA
mA
mV
A
A
Ω
Ω
µs
V
V
µA
µA
µA
The ● denotes specifications which apply over the full operating temperature range,
otherwise specifications are at – 40°C ≤ T_A ≤ 85°C. LTC1174I and LTC1174HVI Only.
SYMBOL PARAMETER
CONDITIONS
V_FB
Feedback Voltage
LTC1174I/LTC1174HVI
I_LBOUT Current Sunk by Pin 2
V_LBOUT = 0.4V (LTC1174I)
V_LBOUT = 0.4V (LTC1174HVI)
I_PEAK Current Limit
I_PGM = V_IN, V_OUT = 0V (LTC1174I)
I_PGM = 0V, V_OUT = 0V (LTC1174I)
I_PGM = V_IN, V_OUT = 0V (LTC1174HVI)
I_PGM = 0V, V_OUT = 0V (LTC1174HVI)
t_OFF
Switch Off-Time (Note 6)
V_OUT at Regulated Value (LTC1174I)
V_OUT at Regulated Value (LTC1174HVI)
R_ON
Switch On Resistance
LTC1174I/LTC1174HVI
MIN TYP MAX
● 1.18 1.25 1.31
● 0.75 1.2 2.0
● 0.50 0.8 1.6
● 0.54 0.60 0.84
0.34
● 0.5 0.60 0.86
0.34
● 2.0 4 6.0
● 1.8 4 6.2
●
0.9 1.7
UNITS
V
mA
mA
A
A
A
A
µs
µs
Ω
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: T_J is calculated from the ambient temperature T_A and power
dissipation P_D according to the following formulas:
LTC1174CN8, LTC1174CN8-3.3, LTC1174CN8-5:
T_J = T_A + (P_D × 110°C/W)
LTC1174CS8, LTC1174CS8-3.3, LTC1174CS8-5:
T_J = T_A + (P_D × 150°C/W)
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